bcc05a9a6e
Updated all By snippets to have matching behavior, consistent argument naming and added countBy as per #100.
16 lines
469 B
Markdown
16 lines
469 B
Markdown
### maxBy
|
|
|
|
Returns the maximum value of an array, after mapping each element to a value using the provided function.
|
|
|
|
Use `Array.map()` to map each element to the value returned by `fn`, `Math.max()` to get the maximum value.
|
|
|
|
```js
|
|
const maxBy = (arr, fn) =>
|
|
Math.max(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));
|
|
```
|
|
|
|
```js
|
|
maxBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 8
|
|
maxBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }],'n'); // 8
|
|
```
|